Improved bubglar-alarm



G 8. ACKER,

I Burglar Alabm No.;6- 9',888.. Patented Oct, 15, I867,

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GEORGE S. 'A'CKER, KALA'MAZOO', MICHIGAN. Letters Patent No. 69,888, dated Octob'er15,1867.

IMPROVED BURGLAR-ALARM.

TO ALL WHOM IT MASY CONCERN:

Be it known that I, GEORGE S. AoKEu, of the city and county of Kalamazoo, in the State of Michigan, have invented certain new: and useful improvements in Burglar-Alarms; and I do hereby declare that the following is a full, clear, andexact-dcscription of the-same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1 is a-perspective view of a part of the interior of a room, exhibiting the alarm, tripper, and door connection.

Figure 2 is an enlarged elevation of tripper.

Figure 3 is a broken, perspectiwe-view of the window-connection.

Similar letters of reference indicate like parts in all the figures.

My invention relates to a spring clock-work alarm with which all windows and doors, accessiblo to burglars or others from the outside of a house, are placed in peculiar connection; and the better to enable others skilled in this particular branch of mechanical art to construct the same, I will now proceed to describe it.

The alarm consistssimply of a driving-wheel, A, operated by a coiled spring, B, which wheel, gearing into 8 a pinion, G, actuates 'an escapement-wheel, D, on the pinion-arbor. The arbor' of the pallet E carries the hammer F, which, as' the pallet oscillates, when thc'escapement is free, strikes rapid strokes upon a bell, G. A lever,

inserted in the pallet-shaft, is designed to lock the pallet-to the escapemen t-wheel, until liberated by the tripping device I am now about to describe. It consists of a pivoted quadrant and arm, I .I, to the outer end of which arnrthc tripping-wire W is hooked when the alarm is to be set. The quadrant has fine ratchettecth-cut on its outer edge, in which a weighted or spring-pawl, P, engages, and it is so set and arranged, in

connection witha tension-spring, S, acting upon the arm J, that it will just support the end of the pallet-lever,

at e, andkeep the e'scapement locked. As soon, however, as the arm J is lifted the quadrant is drawn away from its support of the lever, and held back by the pawl 1?, while. the alarm is'striking the whole or part of the time, determined by the cam-stop arrangement, as scenat T.

The mode in which I cause the pulling down of the upper, and the lifting up of the lower sash, beyond a certain point to strike the alarm, is shown in fig. 3, where :h L represent apair of reversed geared levers pivoted to the window-frame. A wire, M, connected with the wire W, is attached to the inner end of the lower lever, itsouter end (which projects a little beyond the top rail of the sash-frame) being curved upwards, to prevent it from jamming the sash when lowered. A pin, (not seen,) inserted at a proper point in the edgcof the upper sash, strikes in its descent the extreme end of the upper lever, and, .by means of the segmental gear, depresses the end of the lower lever as it is depressed by the lifting action of the lower sash.

' To form a connection with the doors I usually attach a cam-shaped projection, N, to the upper rail, which, acting upon an elbow,f, the projecting arm of which is twisted to conform,'thc other arm being wired to another elbow'or bell-crank, j, near the ceiling, will, when properly arranged, actuate the trippingwire in whatever direction the door may swing.

The alarm may be attached to the wall of 'a bedroom, and remain wound up, care being taken to hook on the ring 11 of the tripping-wire every night, and unhook it in the morning, or the alarm may be needlessly rung, and to reset it'all that is necessary is to shut first the door or window, by the opening of which it has been sprung, then lift the pallet-letter and draw bacl: the pawl, when the tension spring will force back the quadrant to its first position, and the alarm may be rewound by the key is in the ordinary way, the spring coil being sus tained by the ordinary ratchet and pawl.

The end of the lower sash-lever may be so bent that thewireM may pass up in the angle between the casing and wall, or it may pass through the interior of a box window-frame; in fact all the wires may be boxed to be out of sight and prevent being tampered with.

In my mode of releasing the escapement-wheelof the alarm the opening and shutting of doors and windows are not interfered with, as the devices connected therewith require no adjusting, the sole adjustment being that connected with the alarm itself, as heretofore described.

I do not claim connecting the windows and doors of several or all of the rooms in a building with a single coma 2 spring-alarm, irrespective of the mode of connection and operation, but what I claim, and desire to secure by Letters Patent, is

1. I claim connecting the spring-alarm with the tripping-wire W, by the arrangement and combination of the pallet-lever II with the toothed quadrant I J, pawl P, and tension-spring S, substantially as and for the purpose specified.

2. I claim, in combination with the spring-alarm and tripping arrangement aforesaid, the geared levers L L, when the some are connected to the \rimlow-frmncs. and operated by the window-sashes of a building, substantially in the manner and for the use; set forth.

GEORGE S. ACKER.

Witnesses:

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